Types of Waves

Q. Explain the differences between the sounds of a cello and a violin in terms of frequency, pitch and time period.
[5 MARKS]

Q.

A string connected to the end of the tuning fork kept in a horizontal position, will execute _______.

1. a parallel wave motion

2. a transverse wave motion

3. a damped oscillation

4. a circular wave motion

Q. Particles oscillate perpendicular to the direction of wave motion in wave.

1. transverse
2. longitudinal
3. circular

Q. In which of the following media can sound travel as a transverse wave?

1. Water
2. Nitrogen
3. Vacuum
4. Wood

Q. If the amplitude of a sound is tripled, What will be the effect on its loudness?

1. Increases four times
2. Decreases four times
3. Increases six times
4. Decreases six times

Q. Loudness is proportional to the square of the amplitude of a sound wave.

1. False
2. True

Q.

A bird makes a high-pitched sound whereas a lion makes a low-pitched roar. So, the frequency of sound made by lion is ______ that of bird.

1. less than

2. more than

3. None of the above

4. equal to

Q. If the loudness of sound exceeds, it can cause harm to the human ear.

1. $50\text{dB}$
2. $75\text{dB}$
3. $80\text{dB}$

Q. The frequency of a vibrating body is 5 Hz. Calculate its time period?

1. $0.1s$
2. $0.2s$
3. $0.8s$
4. $0.4s$

Q. Which of the following are sources of noise pollution?

1. Crackers
2. Silencers
3. Heavy machines
4. Loud speakers